Valve.



A. LITTMANN.

v VALVE. I APPLICATION FILED JUNEZQI 1914.

1,250,601 Patented Dec. 18, 1917.

lNVE/VTUP UNITED STATES PATENT OFFICE.

AUGUST LITTMANN, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO AMERICAN METAL PRODUCTS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

VALVE.

specification of Letters Patent.

Patented Dec. 18, 191?.

Application filed June 29, 1914. Serial No. 847,809.

- Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Valves, of which the following is a description, reference being had to the accompanying drawings,

which are a part of this specification.

The invention relates to valves or similar machineparts composed of dissimilar metals.

The invention designs more particularly to provide a valve stem or other machine part in which the rod is of ferrous metal, as steel, and the head is of a non-ferrous metal, as a brass or bronze composition for use more particularly in internal combustion engines.

In the drawings, Figure 1 is a vertical sectional view showing the die and the valve stem. Fig, 2 is a detail view of the valve stem, showing a modified form of valve rod.

The valve stem consists of a valve rod 10 of ferrous metal such as steel, to which is attached a head 11 of non-ferrous metal preferably of brass or bronze composition.

Formerly valves have been made by securing the brass or bronze head on to the steel rod by mechanical means such as screw joints, but the present invention is designed to produce a valve in which the valve head is in the condition of having been cast onto the valve stem and in which the metals used in the valve stem and head are of substantially the same coeflicient of expansion.

18 or be split at 19 for giving a better gripping surface to the metal.

This non-ferrous or brassor bronze composition possesses the following qualities: Its coeflicient of expansion is substantially the same as the coefficient of expansion 'of the ferrous metal, thus preventing any tendency of the dissimilar metals from working loose. 7

The invention thusexemplifies a valve stem or other machine part consisting of two dissimilar metals attached together by casting one onto the other, each ofsaid metals having substantially the same coefficient of expansion.

'What I claim is:

A valve for internal combustion engines consisting of a valve stem of wrought metal and a valve head of brass composition in the condition of having been cast onto said stem, the material of the stem and head having substantially the same coeflicient of expans1on.

In testimony whereof, Iaflix my signature, in presence of two witnesses. A

AUGUST LITTMANN.

, Witnesses:

KATHERINE Hour, PETER WEBER. 

